Make the vertical scroll bar bigger and more visible
The vertical scroll bar is very thin and not easy to see or click on. Make it more like a regular Windows slider that is permanently visible.
Sean Ellis commented
"Using standard controls" has been consistent UI advice from Microsoft since Windows 3.1, and for good reason.
Standard controls provide clear signals to the user as to what will happen when used, and they come with a set of default behavior which is difficult to precisely replicate.